Shiori is a teenager with medium-length brown hair and brown eyes. She is wearing the Tendo Girls' school uniform consisting of a beige thigh-high sailor dress with a brown trim and red ribbon, knee-high black socks, and white shoes.
Not much is known about her personality besides that she was good friends with Miku and Akari.
Akari starts telling her how she along with Miku and Shiori were putting P.E. equipment away and she started telling them about the website for suicides, acting creepy. All girls laugh it off, but Akari soon finds out that Shiori went missing after that, her computer screen acting weird. Naho tells them that she will definitely investigate it.
FILE #07: Best Friend
In this chapter it's revealed that Shiori wasn't the one that wrote her name in the website: It was Miku, who blamed her for stealing her boyfriend trying to get revenge on her, not knowing the true dangers of that website.
FILE #17: The Creation of the Abyss
Akari and Naho both see Shiori in the darkness, using a torch to light her head, telling Akari not to come any closer. Naho realises that the voice is coming from behind Shiori. Shiori head-bumps Akari, releaving that all this time, she was decapitated.
Significant plot details end here.
Shiori's death was mainly caused by Miku, who blamed her and wanted her to die. In the end Miku regretted putting her name into the website, as she did not think it will actually work.